Wednesday, July 31, 2013

Solve the system -2x+3y=8 3x-y=-5

We'll solve the system using the elimination
method.


We'll note the equations of the system
as:


-2x+3y = 8 (1)


3x-y = -5
(2)


We'll multiply (2) by
3:


3*(3x-y) = -5*3


9x - 3y =
-15 (3)


We'll add (3) to
(1):


9x - 3y - 2x + 3y=
-15+8


We'll eliminate like
terms:


7x = -7


We'll divide by
-7:


x = -1


We'll substitute
the value of x into (2):


3x-y =
-5


-3- y = -5


We'll add 3 both
sides:


-y = -5+3


-y =
-2


y = 2


The
solution of the system is: {(-1 , 2)}.

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